Bureau Highlights

GWOF 22

Nitrate in the Ground Water and Surface Water of the Summit Valley near Butte, Montana

This report by Bureau reseacher John LaFave, describes the elevated levels of nitrate in ground water in the Summit Valley near Butte, and assesses the hydrogeologic factors and land uses that may contribute to nitrate contamination

Sapphires in the Butte-Deer Lodge area, Montana

For anyone who is enthusiastic about sapphires.

This stunning, full-color publication describes the sapphire deposits and occurrences in the area north and west of Butte. The identification, size, shape, color, and mineral inclusions of sapphires in the area are discussed, with photos throughout.

Postcard version of our MC 19– "Butte, Montana, Richest Hill on Earth; 100 Years of Underground Mining" map.

Full color on glossy
stock, 8 by 6 inches

SP 117

Probabilistic Earthquake Hazard Maps for the State of Montana

Because of the potential earthquake threat to dams in Montana, a set of probabilistic earthquake ground motion maps have been developed for the Montana Department of Natural Resources and Conservation (DNRC) Dam Safety Program.

The maps display ground motions for two site conditions: soft rock and the ground surface. In addition to the ground shaking maps, a set of 6 maps have been developed to aid DNRC
and practicing engineers in the analysis of site response and liquefaction potential. These maps display the modal earthquake magnitude and modal distance of the magnitude–distance distribution that contribute to the hazard at a specified location for the three return periods.

Our Montana Geologic Postcard can be purchased
from our sales office for only 50¢ or click here to order.